Engine cylinder



Oct. 28, 1930;

s. PIELSTI CK ENGINE CYLINDER Filed April 15. 1929 Patented Oct. 1930 'UUTNITED STATES PATENT OFFICE GUSTAV PIELSTIOK, OF AUGSIBURG, GERMANY, ASSIGNOR TO MASOHINENEAAIBRIK AUGSBURG-N'O'RNBERG, A. G., OF AUGSBURG, GERMANY, A' CORPORATION OF GER- ENGINE CYLINDER Application filed April 15, 1929, Serial No. 355,175, and in Germany April 28, 1928.

This invention relates to engine cylinders, and more particularly to cylinders for engines of the two cycle type.

One object of the invention is the provision 'Jof a cylinder for combustion engines comprising a cylinder portion forming part of the working cylinder and an attached end portion which has a wall tapering gradually in cross section towards the first" mentioned 10 cylinder portion and providing a part of the working cylinder.

-- Another object of the invention is the provision of a cylinder for an internal combustion engine having an intermediate portion and an end piece in both of which the piston is adapted to reciprocate, the end piece being attached to the intermediate portion by means of a flanged cooling jacket provided around the end piece.

Other objects and advantages of the invention will be apparent from the following description and from the accompanying drawing, in which the single view is a longitudinal section of a cylinder embodying the present invention.

The cylinder shown in the drawing, which illustrates the invention as applied to a double acting two cycle internal combustion engine, comprises an intermediate cylinder portion 0 formed preferably asa metal casting and providing the intermediate part of a working cylinder. As the-invention is herein set forth as applied to an engine of the Diesel type operating with .fuelless' injection and having scavenging and exhaust holes in the cylinder wall, the intermediate portion 0 is provided with scavenging slots a and exhaust slots 6 for both sides of the acting cylinder. A cooling chamber wall at surrounds the portion 0 of the working cylinder, thiscooling wall d being preferably cast with portion a of the cylinder.

The intermediate cylinder portion a terminates in flanges eupon which rest end pieces or covers f, the latter having outwardly extending flanges g at their inner terminal portions which rest upon the flanges e of portion 0. The covers or end pieces 7 are approximately flat at the end of the combustion chambers providing approximately flat cylinder heads which are of sufiicient thickhigh pressures obtaining when the piston is at the end of its stroke and as there is consequently less bursting tendency at the inner portions of this wall. This construction, however, provides for a light cylinder head end piece,- yet one which is of suflicient strength to withstand the pressures and strains imposed upon it. Moreover, by the reduction of the thickness of the inner portions of the cylinder end piece cooling of the frictional wearsurfaces which are in frictional engagement with the piston and piston rings is greatly facilitated and such surfaces operate at a cooler temperature which aids in efficient operation. Preferably the cross sectional thickness of the wall of the end pieces f is suitably coordinated with the pressures and strains to which the particular portion of the wall is subjected in opera tion, the inner portions of the wall being thinner as the combustion pressure and wall temperatures are gradually decreased from the combustion chamber towards the inter- These cooling jackets are each shaped in correspondence with an end piece 7, and spaced therefrom in such a way as to provide a cooling chamber through which water or other suitable cooling liquid may be circulated. At one end of the cylinder the end piece f is provided witha throat 7' which receives the fuel injecting means, the opposite end piece 7 having a corresponding throat f receiving the stufling box. The cooling jackets have suitablde fa pertures receiving the two throats f an On the inner end of each cooling jacket is an outwardly extending flan e or rim h which fits over andabout the ange g of the end piece f. The-cooling 'acket ange-h is secured to the flange e o the intermediate cylinder portion by suitable attaching bolts (not shown), and the flange It thus clamps the flange g of the cylinder end pie'ce f between it andthe cylinder portion 0. Preferably the two opposite end pieces f of a cylinder are firmly clamped in place by thro h bolts interconnectinlg opposing cooling jac ets and attaching t em firmly together and thus securing the end pieces of the cylinder in place. i

The cooling jackets h are connected to the cooling wall (1 of the intermediate cylinder by suitable connections 1' so as to form a cooli chamber extending from one end ofthe cy 'nder to the other so'the cooling medium entering at the-inlet j may flow through the entire cooling jacket, flowing out through the openin k.

While the form of ap aratus herein described constitutes a pre erred embodiment of the invention, it is to be understood that the invention is not limited to this precise form of apparatus, and that changes may be made therein without de arting from the scope of the invention whic is defined in the appended claims.

What is claimed is: v

1. A cylinder for internal combustion engines comprising a cylinder portion forming a part of the working cylinder, and a separate end piece attached thereto, said end piece having a cylindrical bore providing the outer part of a workin cylinder and an approximately flat cylin er head at the end of saidbore, the wall of said end piece inwardly of the cylinder head gradually decreasing inwardly in cross section, and a cooling jacket around said end piece, said end piece and said jacket having abutting end flanges, the flange of the end piece being clamped between the flange of the jacket and the outer end of said cylinder portion.

2. A cylinder for double acting two cycle internal combustion engines comprising an intermediate cylinder portion and two end pieces which with said cylinder'portion form a working cylinder, each end piece providing a substantially flat cylinder head and having a substantially cylindrical wall gradually decreasing in cross sectional dimensions inwardly of the cylinder head, and a cooling jacket around each end piece, each end piece and jacket terminating in outwardly extending flanges, the flange of the end piece being clamped between the flange of the jacket and the intermediate cylinder portion.

3. A cylinder for double acting two cycle internal combustion engines comprising an intermediate 0 linder portion and two end pieces attache thereto, said end pieces each providing a cylinder head and having an inwardly exten ing' wall forming a part of the working cylinder, each end iece terminatin in an outwardly extending ange, and a coo ing jacket around each end iece, said jacket terminating in a flange, the ange on the end piece being clam d between the'jacket flange and an end of said intermediate. cylinder portion.

4. A cylinder for a two'cycle internal com bustion engine comprising a cylinder portion forming a art of the working cylinder, a

separate en piece attached thereto said end signature.

GUSTAV PIELSTICK. 

